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  1. Humans

    Letters from the October 21, 2006, issue of Science News

    Fish story? To argue that the concentrations reported in “Macho Moms: Perchlorate pollutant masculinizes fish” (SN: 8/12/06, p. 99) are environmentally relevant is misleading. Those concentrations are usually in groundwater, not surface waters. I’ve been involved in the environmental field for almost 20 years and have yet to hear of any fish being caught in […]

    By Science News
  2. Math

    Knots in Proteins

    Knotted proteins are rare but more than just random occurrences.

    By Ivars Peterson
  3. Humans

    From the October 10, 1936, issue

    The inner beauty of leaves, a better treatment for pneumonia, and alcohol fuel for cars.